US2819523A

US2819523A - Scissors

Info

Publication number: US2819523A
Application number: US566064A
Authority: US
Inventors: Stoeveken Bernhard
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-02-08
Filing date: 1956-02-08
Publication date: 1958-01-14
Anticipated expiration: 1975-01-14

Description

Jan. 14, 1958 B. STOEVEKEN SCISSORS 2 Sheets-Sheet 1 Filed Feb. 8, 1956 3 INVENTOR.

Wm Hmm' 1. 7 [Mm/L S. W? W Jan. 14, 1958 Filed Feb. 8, 1956 B. S-TOEVEKEN 2,819,523

SCISSORS 2 sheets sheet 2 INVENTOR.

WW Mvovm mm s.

United States Patent '5 SCISSORS Bernhard Stoeveken, Pfullingen, Wurttemberg, Germany Application February 8, 1956, Serial No. 566,064

Claims priority, application Germany February 8, 1955 1 Claim. (Cl. 30-260) The present invention relates to scissors.

More particularly, the present invention relates to scissors which are provided with removable cutting blades.

There exist scissors wherein the elongated blade bodies instead of being themselves formed with cutting edges carry separate cutting blades. However, considerable difficulty has been encountered not only in properly positioning these cutting blades on the blade bodies, but also in providing a suitable arrangement by means of which the blades may be easily placed onto and removed from the scissors.

It is therefore an object of the present invention to overcome the above disadvantages by providing a scissors or pair of scissors wherein the blade bodies or body members carry individual cutting blades, which cutting blades are firmly supported by the body members and which may be easily placed thereon and removed therefrom.

It is another object of the present invention to provide a scissors which is sturdy, the keenness of which may very easily be maintained, and which will give long periods of trouble free service.

With the above objects in View, the present invention mainly resides in a scissors or pair of scissors which includes a pair of elongated body members connected to each other for pivotal movement relative to each other about a pivot axis. Each of the body members has an elongated face forming a predetermined angle with a plane normal to the pivot axis. Each of these body members is so constructed and arranged that at its respective elongated face the thickness of each body member in a direction parallel to the pivot axis is at least as great as its maximum thickness in this direction. The faces move toward, past and away from each other duringpivotal movement of the body members relative to each other about the pivot axis. A pair of elongated cooperating cutting blades are mounted onthe elongated faces of the body members, respectively, in such a manner that each cutting blade is in face-to-face relationship with the respective elongated face so that the cutting angle of the pair of scissors is equal to the predetermined angle.

The novel features which are considered as character istic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. l is a perspective view of a preferred embodiment of a scissors according to the present invention, the scissors being shown in partly opened condition;

Fig. 2 is another perspective view of the scissors illustrated in Fig. l, the scissors being shown in closed condition;

Fig. 3 is a sectional view taken substantially along lines 3-3 of Fig. l;

Fig. 4 is yet another perspective view of the scissors illustrated in Fig. 1, one of the cutting blades being shown in its semi-fastened position;

Fig. 5 is a perspective view, similar to that shown in Fig. 4, at the instant one of the cutting blades is about to be moved out of its fastened position; and

Fig. 6 is a sectional view of another preferred em-' bodiment of scissors according to the present invention.

Referring now to the drawings, and to Figs. 1 to 5 thereof in particular, there is shown a scissors or pair of scissors which includes two elongated blade body membets 1 and 2 which are mounted for pivotal movement relative to each other about a pivot axis A. The

body members

1 and 2 are respectively formed with elongated, outwardly bulging continuous faces 1a and 2a which are substantially arcuate or convex. and 2 are so shaped that they are, at their faces 1a and 2a, of flat cross section and, as may best be seen in Fig. 3, a plane tangent to either of the faces 1a and 2a at any portion thereof forms an angle C with a plane P which is normal or perpendicular to the pivot axis A.

The

body members

1 and 2 carry cutting blades 3 and 4, respectively. The cutting blades are formed with opposite parallel faces 3a, 3b and 4a, 4b and are positioned on the

body members

1 and 2 in such a manner that throughout the entire lengths of the cutting blades the faces 3b and ib are in face-to-face relationship with the faces la and 2a, respectively. As a result, the faces 3:! and 4a are also arcuate or convex and are parallel to and coextensive with the faces la and 2a, respectively. Consequently, the cutting angle C of the scissors, which is the angle formed between a plane tangent to either of the faces 3a and an at any portion thereof and the plane P normal to the pivot axis A, is equal to the angle C referred to above.

Also, the curvature of the faces la and 2a is so selected that the mating angle 5 formed between the cutting blades 3 and 4 is maintained substantially constant throughout pivotal movement of the

body members

1 and 2 relative to each other.

As may best be seen in Fig. 3, each of the body mem hers I and 2 is so constructed and arranged that at its respective face the thickness of each body member, in a direction parallel to the pivot axis A, is at least as great as its maximum thickness D in this direction. As aresult, the width W of each of the faces 1:: and 2a is large, thereby providing a firm support for the cutting blade superposed thereupon.

are maintained under tension, thereby insuring their prop er face-to-facecontact with the faces la and 2a throughout the entire length of the cutting blades.

The mounting means includes a fastening arrangement which is so constructed and arranged thateach 'of the cutting blades is movable relative to the face of the respective body member in longitudinal direction between a fastened position wherein each end of the blade is fastened to the respective body member and an un fastened position wherein the cutting blade is capable of being removed from the face of the respective body Furthermore, the arrangement of the parts member. may be such that each cutting blade is capable of as} suming a semi-fastened position intermediate its fas'tenedand unfastened positions wherein one end of the cutting blade is fastened to the respective body member and the other end of the cutting blade is unfastened therefrom, thereby permitting each cutting blade, while the satneis The body members 1 According to the preferred em bodiment, the cutting blades 3 and 4 are resilient and,

in its semi-fastened position, to assume a substantially fiat configuration so that the unfastened end of the cutting blade is spaced from the face of the respective body member.

Such a fastening means or arrangement is shown in the drawings, and includes a pair of screws or pins 6 and 7 which project from the faces of the body members. The screws 6 and '7 are adapted to be received within elongated, longitudinally extending

slots

8 and 9 formed in the regions of the free ends of the cutting blades. Each of the screws or pins 6 and 7 is formed with a shank portion and a head portion having a cross section greater than that of the shank portion, and each of the

slots

8 and 9 is formed with an enlarged recess portion 3', 9'.

The axial length of the shank portion of each screw is substantially equal to the thickness of the cutting blades, and the dimensions of the

slots

8 and 9 are such that the head portions of the screws 6 and 7 may protrude through the enlarged recess portions 8' and 9 without being capable of passing through the remainder of these slots.

As is best shown in Figs. 2 and 5, the slot 53 is slightly longer than the slot 8, and the distance X between the screws6 and 7 is slightly greater than the distance Y between the enlarged

recesses

8 and 9 of the

slots

8 and 9.

By virtue of the above arrangement, each individual cutting blade may very easily be placed upon or removed from the face of one of the body members. The former may be accomplished by passing the enlarged recess portion 9' of a blade 3 over the screw 7 and by thereafter moving the blade 3 in the direction of the arrow 10 so that the blade will assume its semi-fastened position shown in Fig. 4. In this figure, the blade 3 has been moved rightwardly a distance sufficient to place the enlarged recess portion 8' in registration with the screw 6, so that when the right-hand end of the blade 3 is depressed in the direction of the arrow 11, the pin 6 will be free to pass through this enlarged recess portion 8. The blade 3 may thereupon be moved rightwardly a little further until the enlarged recess portion 8' and the screw 6 are out of registration with each other. It will be understood that inasmuch as the blade 3, in its normal or untensioned condition, is fiat, the inherent resiliency of the blade will cause the same to be under tension while it occupies its fastened position. This will insure excellent face-to-face contact between the blade 3 and the face 1a of the body member 1 which, in turn, will assure the proper maintenance of the correct cutting angle C of the scissors.

The blade 3, which is shown in its fastened position in Fig. 5, may be removed from the body member 1 by inserting a screw driver S or other suitable implement between the right-hand free end of the blade 3 and the portion 1b of the body mmeber 1. With the latter acting as a fulcrum, the screw driver may be pivoted in the direction of the arrow 12 so as to cause movement of the blade 3 in the direction of the arrow 13. By virtue of the fact that the distance Y is smaller than the distance X, the enlarged recess portion 8' of the slot 8 will enter into registration with the head portion of the screw 6 before the enlarged recess portion 9' of the slot 9 will enter into registration with the head portion of the screw 7. As a result, as soon as the enlarged recess portion 8' registers with the head portion of the screw 6, the right-hand free end of the blade 3 will, under the influence of its own resiliency, be free to spring upwardly, the left-hand end portion of the blade 3 remaining fastened to the face 1a of the body member 1. The cutting blade 3 thus assumes its semi-fastened position shown in Fig. 4, from which it may easily be moved leftwardly until the head portion of the screw 7 and the enlarged recess portion 9 register with each other. The blade 3 is then in its unfastened position wherein it is capable of being removed from the face 1a of the body member 1.

In the embodiment described in Figs. 1 to the faces 1a and 2a have been shown as being arcuate. It will be 4 understood, however, that any suitable outwardly bulging configuration may be imparted to these faces. For example, the faces may be composed of two substantially planar end surface portions forming with each other a solid angle of less than and a convex intermediate surface portion joining the two end portions. The composite face may then be so arranged that both of the end surface portions as well as a plane tangent to the intermediate surface portion at any point thereof form the above mentioned predetermined angle with the plane P that is normal or perpendicular to the pivot axis A. It will thus be seen that according to the present invention, the

body members

1 and 2 may be formed with any outwardly bulging faces 1a and 2a which, and a plane tangent to which at any non-planar portion thereof, form the above discussed angle C with the plane P.

As in known scissors, each of the body members is fashioned as a two-armed lever. If desired, one or both of the body members may be formed on that arm thereof which is opposite to the arm which has the elongated face with a transverse recess capable of receiving therewithin an inlay 14 which may be made of ceramic or other material. surface 10 of the body member 1 and slides against the corresponding inner surface of the body member 2 during pivotal movement of these body members relative to each other. In this way, the right arms of the

body members

1 and 2, as viewed in Fig. 4, are pressed apart, thereby causing the cutting edges of the cutting blades 3 and 4 to bear against each other during pivotal movement of the

body members

1 and 2. If desired, the inlay 14 may be a replaceable one so that after any given inlay has become worn it may be replaced. In this way, proper operation of the scissors over long periods of time is assured.

In the embodiment illustrated in Fig. 6, the

body members

21 and 2?. carry cutting

blades

23 and 24, respectively. The embodiment of Fig. 6 diifers from the above described one in that the cross-sectional configuration of the body members is substantially angle-shaped. However, the arrangement is such that the thickness of each of the body members, in a direction parallel to the pivot axis A, is at least as great as the maximum thickness of the body members in this direction.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of scissors differing from the types described above.

While the invention has been illustrated and described as embodied in a pair of scissors provided with removable cutting blades, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

In a pair of scissors,'in combination, a pair of elongated body members connected to each other for pivotal movement relative to each other about a pivot axis, each of said body members having a substantially convex elongated face a plane tangent to which at any portion thereof forms a predetermined angle with a plane normal to said pivot axis, each of said body members being so constructed and arranged that at its respective elongated face the thickness of each body member in a direction parallel to said pivot axis is at least as great as its maximum thickness in said direction, said faces moving toward, past The inlay projects somewhat beyond the inner g and away from each other during pivotal movement of said body members relative to each other about said pivot axis; a pair of elongated resilient normally substantially flat cutting blades; and mounting means for mounting said cutting blades on said elongated faces of said body members, respectively, in such a manner that said cutting blades are maintained under tension in face-t0- face relationship with the respective elongated faces and cooperate with each other during pivotal movement of said body members relative to each other, so that the cutting angle of the pair of scissors is equal to said predetermined angle, said mounting means including fastening means for fastening the opposite ends of each of said cutting blades to the respective body member in regions of the end portions of the face thereof, said fastening means being so constructed and arranged that each of said cutting blades is movable relative the face of the respec tive body member in longitudinal direction between a fastened position wherein each end of said blade is fastened to said respective body member and an unfastened position wherein said cutting blade is capable of being removed from the face of said respective body member, each of said cutting blades being capable of assuming a semi-fastened position intermediate its fastened and unfastened positions wherein one end of the cutting blade is fastened to the respective body member and the other end is unfastened therefrom, thereby permitting each cutting blade, while the same is in its semi-fastened position, to assume a substantially flat configuration so that the unfastened end of the cutting blade is spaced from the face of the respective body member.

References (lited in the file of this patent UNITED STATES PATENTS 1,965,443 Wyner et al. July 3, 1934 2,373,607 Snell Apr. 10, 1945 2,574,066 See Nov. 6, 1951 2,607,986 Sherr Aug. 26, 1952 FOREIGN PATENTS 1,404 Great Britain of 1886